WO2012062237A1 - Vacuum hood device - Google Patents
Vacuum hood device Download PDFInfo
- Publication number
- WO2012062237A1 WO2012062237A1 PCT/DE2011/000334 DE2011000334W WO2012062237A1 WO 2012062237 A1 WO2012062237 A1 WO 2012062237A1 DE 2011000334 W DE2011000334 W DE 2011000334W WO 2012062237 A1 WO2012062237 A1 WO 2012062237A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- sealing
- vacuum hood
- sealing wedge
- wedge
- composite substrate
- Prior art date
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
- B29C43/32—Component parts, details or accessories; Auxiliary operations
- B29C43/36—Moulds for making articles of definite length, i.e. discrete articles
- B29C43/3642—Bags, bleeder sheets or cauls for isostatic pressing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
- B29C43/32—Component parts, details or accessories; Auxiliary operations
- B29C43/36—Moulds for making articles of definite length, i.e. discrete articles
- B29C43/3607—Moulds for making articles of definite length, i.e. discrete articles with sealing means or the like
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
- B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
- B29C70/28—Shaping operations therefor
- B29C70/54—Component parts, details or accessories; Auxiliary operations, e.g. feeding or storage of prepregs or SMC after impregnation or during ageing
- B29C70/544—Details of vacuum bags, e.g. materials or shape
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
- B29C43/32—Component parts, details or accessories; Auxiliary operations
- B29C43/36—Moulds for making articles of definite length, i.e. discrete articles
- B29C43/3642—Bags, bleeder sheets or cauls for isostatic pressing
- B29C2043/3644—Vacuum bags; Details thereof, e.g. fixing or clamping
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
- B29C70/04—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts comprising reinforcements only, e.g. self-reinforcing plastics
- B29C70/28—Shaping operations therefor
- B29C70/40—Shaping or impregnating by compression not applied
- B29C70/42—Shaping or impregnating by compression not applied for producing articles of definite length, i.e. discrete articles
- B29C70/44—Shaping or impregnating by compression not applied for producing articles of definite length, i.e. discrete articles using isostatic pressure, e.g. pressure difference-moulding, vacuum bag-moulding, autoclave-moulding or expanding rubber-moulding
Definitions
- the invention relates to a vacuum hood device having a vacuum hood for gas-tight covering during gas-pressure compression of a layer of a curable composite substrate applied to a solid molded body comprising a fibrous structure and a matrix of a curable viscous filling material introduced into the fibrous structure.
- Vacuum hoods are used in the process of vacuum evacuation, in which modern plastic materials are brought into a predetermined shape and then cured.
- a workpiece is shielded from the ambient atmosphere by means of a sealing film and sealing cord (evacuated) and then placed under vacuum.
- a disadvantage of this method is that a sufficient seal between the sealing film and the workpiece, in particular in a peripheral region of the sealing film is achieved only at great expense of material and time for a sufficient sealing work, with an exact attachment of a
- This period of time to be used may, depending on the resin system used, quickly exceed the gelling time of the plastic, i. the plastic begins to harden before it has been shaped by means of vacuum and tools or has been sufficiently compacted by vacuum evacuation.
- Another disadvantage of the film method is a lack of reusability of a sealing film, which is limited to a single use.
- An important process step in plastic processing by vacuum evacuation is the use of an autoclave, i. a heatable pressure vessel in which workpieces to be produced can be exposed to an elevated atmospheric pressure (up to 10 bar).
- an upper-side pressure can be applied to a workpiece, whereby a particularly dimensionally accurate production, a plastic material structure of particularly high quality and an exact edge formation in the manufacture of a workpiece is made possible.
- the use of an autoclave in a vacuum evacuation requires a robust tightness in the region of a transition zone of the workpiece to the evacuation, since the effect of any leaks in the region of the sealing film in the autoclave is enhanced by the increased ambient pressure.
- silicone pressure hoods are inventively developed. Due to the chemical composition of epoxy resins in these autoclave curing at a pressure of 2 to 4 ATU and a temperature of about 140 ° C is provided. The pressure prevents outgassing of resin components, as would otherwise occur especially at a high curing temperature.
- the vacuum hood is made of an elastic plastic material and in a peripheral region formed integrally with the vacuum hood sealing wedge contains, which gas-tight engagement during compression of the layer of hardenable composite substrate in a sealing groove formed in a peripheral region of the molded body.
- the vacuum hood is made of a resilient plastic material and in a peripheral region integrally formed with the vacuum hood sealing wedge, during compression of the layer of hardenable composite substrate in a peripheral region of the Molded sealing groove engages gas-tight, achieved that a cover is created, which can be made to fit the surface profile of a produced from the composite substrate workpiece, all contour areas of the workpiece during a compression process on the one hand evenly with an overpressure and on the other hand uniformly subjected to negative pressure ,
- hood device according to the invention When using the hood device according to the invention, in particular the pressure, tensile and stress loads which frequently occur in the conventionally used sealing foils are avoided, so that when the hood device according to the invention is used a local reduction of a compression pressure and associated resin accumulations are avoided.
- the hood device according to the invention is so robust that it is suitable for a plurality of applications. It is thus not a disposable tool like the conventional sealing foil with sealing cord.
- the sealing wedge is frustoconical in cross section.
- a base surface of the sealing wedge is formed concavely curved in cross section.
- the sealing wedge is preferably dimensioned in order to fit in the area of the lateral limbs in an interference fit into the sealing groove made of a solid material.
- the sealing groove in cross-section forms a frustkonisch formed cavity with a concave curved base.
- the sealing groove is preferably dimensioned to at in In the region of the side legs given press fit of the sealing wedge between the base surface of the sealing wedge and the base of the frustoconical cavity to ensure the formation of a gas-filled space.
- the clearance is preferably dimensioned to occupy a volume in the range of 10% to 20% of the volume of the frustoconical cavity prior to the operation of pressurizing gas through a layer of a curable composite substrate.
- the elasticity of the elastic plastic material of the sealing wedge is preferably dimensioned to ensure movement of the base surface of the sealing wedge towards the base of the frustoconical cavity of the sealing groove in the process of gas pressure compression of a layer of a hardenable composite substrate, without even at one Place the base to touch.
- the elastic plastic material of the silicone cover including the sealing wedge may preferably be formed of a silicone rubber, a latex material or an elastomer, and the fiber structure is preferably formed by a fiber fabric.
- Fig. 1 shows a preferred embodiment of the device according to the invention in a view obliquely from above;
- Fig. 2 in Fig. 1 illustrated preferred embodiment of the device according to the invention in a detailed view from below.
- Fig. 3 shows a preferred embodiment of the device according to the invention in a form of the body representing view obliquely from above.
- Fig. 4 shows a preferred embodiment of the device according to the invention in a side view representing the molded body.
- the vacuum hood apparatus 100 includes a vacuum hood 110 for gas-tightly covering a composite substrate having a fibrous structure and a matrix of a hardenable viscous filling material introduced into the fibrous structure, the vacuum hood 110 being suitable for use during pressing and curing of the Composite substrate is provided, in which a layer of a curable composite substrate applied to a solid mold 120 can be pressed onto the molded body 120 by means of gas pressure.
- the vacuum hood 110 is made of an elastic plastic material and contains in a peripheral region an integrally formed with the vacuum hood 110 sealing wedge 130 which engages in a gastight manner during compression of the layer of thermosetting composite substrate in a formed in a peripheral region of the molding 120 sealing groove 121.
- the sealing wedge 130 is frustoconical in cross-section, wherein a base surface 131 of the sealing wedge 130 is formed concavely curved in cross section. Furthermore, the sealing wedge 130 is dimensioned to be in the range of side leg 122 in a press fit fit into the sealing groove 121 made of a solid material.
- the sealing groove 121 forms in cross-section a frustkonisch formed cavity with a concave curved base 123 and is dimensioned at given in the lateral leg 122 press fit of the sealing wedge 130 between the base surface 131 of the sealing wedge 130 and the base 123 of frustkonischen cavity forming a gas-filled Ensure free space.
- the free space is dimensioned in order to assume a volume in the range of 20% of the volume of the frustoconical cavity in advance of the operation of a gas pressure-induced pressing of a layer of a curable composite substrate.
- the elasticity of the elastic plastic material of the sealing wedge 130 is dimensioned to ensure a movement of the base surface 131 of the sealing wedge 130 in the direction of the base surface 123 of the frustoconical cavity of the sealing groove 121 in the process of a gas pressure caused by pressing a layer of a curable composite substrate without only to touch the base 123 at one point.
- the elastic plastic material of the vacuum hood 110 including the sealing wedge 130 is formed of a silicone rubber, and the fiber structure is formed of a fiber fabric.
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PL11722291T PL2637833T3 (en) | 2010-11-10 | 2011-03-25 | Vacuum bag device |
DE112011103720T DE112011103720A5 (en) | 2010-11-10 | 2011-03-25 | Vacuum hood device |
EP11722291.9A EP2637833B1 (en) | 2010-11-10 | 2011-03-25 | Vacuum bag device |
ES11722291.9T ES2470968T3 (en) | 2010-11-10 | 2011-03-25 | Vacuum bell device |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEPCT/DE2010/001314 | 2010-11-10 | ||
DE2010001314 | 2010-11-10 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2012062237A1 true WO2012062237A1 (en) | 2012-05-18 |
Family
ID=44116183
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/DE2011/000334 WO2012062237A1 (en) | 2010-11-10 | 2011-03-25 | Vacuum hood device |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP2637833B1 (en) |
DE (1) | DE112011103720A5 (en) |
ES (1) | ES2470968T3 (en) |
PL (1) | PL2637833T3 (en) |
WO (1) | WO2012062237A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2015169272A1 (en) * | 2014-05-06 | 2015-11-12 | Piekenbrink Composite Gmbh | Segmented vacuum hood |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3311517A (en) * | 1962-08-02 | 1967-03-28 | Pittsburgh Plate Glass Co | Method of laminating transparent assemblies |
GB2172542A (en) * | 1985-03-19 | 1986-09-24 | Hazeldine Ind Group Limited | Moulds |
WO1987005557A1 (en) * | 1986-03-13 | 1987-09-24 | M & T Laminates Limited | Lamination of sheet materials |
DE4222267A1 (en) * | 1991-09-19 | 1993-04-01 | Anger Electronic Gmbh | Equipment for laminating plastic films - comprises evacuated chamber with hinged top and fixed cooled base, contg. stack of films, rubber pressure cushion and e.g. heating mat |
US6031212A (en) * | 1991-04-09 | 2000-02-29 | The Boeing Company | Heating apparatus for composite structure repair |
US20070296126A1 (en) * | 2006-06-21 | 2007-12-27 | Audette Lawrence F | Reusable silicone vacuum bag/tool flange sealing method |
-
2011
- 2011-03-25 ES ES11722291.9T patent/ES2470968T3/en active Active
- 2011-03-25 EP EP11722291.9A patent/EP2637833B1/en active Active
- 2011-03-25 PL PL11722291T patent/PL2637833T3/en unknown
- 2011-03-25 DE DE112011103720T patent/DE112011103720A5/en not_active Withdrawn
- 2011-03-25 WO PCT/DE2011/000334 patent/WO2012062237A1/en active Application Filing
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3311517A (en) * | 1962-08-02 | 1967-03-28 | Pittsburgh Plate Glass Co | Method of laminating transparent assemblies |
GB2172542A (en) * | 1985-03-19 | 1986-09-24 | Hazeldine Ind Group Limited | Moulds |
WO1987005557A1 (en) * | 1986-03-13 | 1987-09-24 | M & T Laminates Limited | Lamination of sheet materials |
US6031212A (en) * | 1991-04-09 | 2000-02-29 | The Boeing Company | Heating apparatus for composite structure repair |
DE4222267A1 (en) * | 1991-09-19 | 1993-04-01 | Anger Electronic Gmbh | Equipment for laminating plastic films - comprises evacuated chamber with hinged top and fixed cooled base, contg. stack of films, rubber pressure cushion and e.g. heating mat |
US20070296126A1 (en) * | 2006-06-21 | 2007-12-27 | Audette Lawrence F | Reusable silicone vacuum bag/tool flange sealing method |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2015169272A1 (en) * | 2014-05-06 | 2015-11-12 | Piekenbrink Composite Gmbh | Segmented vacuum hood |
Also Published As
Publication number | Publication date |
---|---|
EP2637833A1 (en) | 2013-09-18 |
PL2637833T3 (en) | 2014-09-30 |
EP2637833B1 (en) | 2014-03-12 |
ES2470968T3 (en) | 2014-06-24 |
DE112011103720A5 (en) | 2013-11-14 |
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